Davis etal
method op making plastic book covers



a 1 g O6 UNITED STATES PATENT OFFICE Published at the request of the applicant or owner in accordance with the Notice of Apr. 11, 1968, 849 O.G. 1221. Iden- T k tification is by serial number of the application and the heading indicates the number of pages of specification, including claims, and of sheets oi. drawing contained in the application as originally filed. The file of this application is available to the public for inspection; reproduction may be purchased for 30 cents per sheet.

,' Applications published under the Defensive Publication Program have not been examined as to the merits of alleged invention. The Patent Ofilce makes no assertion as to the novelty of the disclosed subject matter.

PUBLISHED NOVEMBER 18, 1969 832,247 METHOD OF MAKING PLASTIC BOOK COVERS Robert B. Davis, 8A Mayberry Drive, Apt. 6, Westboro,

Mass. 01581, and Robert B. McFall, P.0. Box 511,

Kingsport, Tenn. 37662 Filed June 11, 1969. Published Nov. 18, 1969 Int. Cl. B29c 17/14; B29f 3/01 US. Cl. 264-151 3 Claims 1 Sheet Drawing. 7 Pages Specification A method of making book covers from thermoplastic material by first extruding a sheet, then while the sheet is still molten, embossing one surface of the sheet with a pattern or design which includes depressed hinge lines extending in a direction across the sheet or perpendicular to the direction of extrusion, and cooling the sheet. In this manner, the molecules at the hinges are oriented during embossing across the hinges,

DEF. PUB.

Nov, 18, 1969 R. BQDAVIS ETA METHOD OF MAKING PLASTIC BOOK COVERS Filed June 11, 1969 ROBERT B. DAVIS ROBERT BMCFALL INVENTORS ATTORNEY 

